Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7b4763c2c771e1…

MALICIOUS

PDF

39.5 KB Created: 2021-05-20 01:27:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8bc236653356b706067cc7a2fd8feeef SHA-1: e019c4c41ee9182b4f29f40f45a3ca367ca50622 SHA-256: fb7b4763c2c771e157cf07b3eeea3886bd597c7a1ec57b832803b5dac77b261a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be SEO spam related to games and hacks. One prominent URL, https://netcdn.xyz/app/835599320/tiktok-free-coins-game-hack, is directly embedded. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to redirect users to potentially harmful sites or to generate traffic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/835599320/tiktok-free-coins-game-hack
    • http://homequeen.de/images/how-to-get-a-refund-on-roblox-2021_GM431946152.pdf
    • http://homequeen.de/images/coin-master-free-spins-link-october-2021_GM406889139.pdf
    • http://homequeen.de/images/free-coin-master-spins_GM406889139.pdf
    • http://homequeen.de/images/hack-a-game_GM431946152.pdf
    • http://homequeen.de/images/how-to-hack-to-get-robux_GM431946152.pdf
    • http://homequeen.de/images/is-minecraft-free-on-xbox-one_GM479516143.pdf
    • http://homequeen.de/images/free-robux-apk_GM431946152.pdf
    • http://homequeen.de/images/free-robux-websites-that-work_GM431946152.pdf
    • http://homequeen.de/images/free-spins-coin-master-generator_GM406889139.pdf
    • http://homequeen.de/images/www-free-robux_GM431946152.pdf
    • http://homequeen.de/images/links-to-free-spins-on-coin-master_GM406889139.pdf
    • http://homequeen.de/images/how-do-you-hack-roblox_GM431946152.pdf
    • http://homequeen.de/images/free-robux-survey_GM431946152.pdf
    • http://homequeen.de/images/how-to-hack-a-minecraft-account_GM479516143.pdf
    • http://homequeen.de/images/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • http://homequeen.de/images/legit-free-spins-coin-master_GM406889139.pdf
    • http://homequeen.de/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://homequeen.de/images/promo-codes-for-free-robux_GM431946152.pdf
    • http://homequeen.de/images/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • http://homequeen.de/images/is-minecraft-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046b0.bin
3ddbf627e24fca970a1ef8d2c7c9e390e2ec97678bef5325f0917de76e61cf6f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46B0 23024 bytes
font_01_sfnt_off00007a78.bin
c119c6391256baee135fe45a6efa6cd7a32bae01f627693d92cb9cbbc452910c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A78 17456 bytes